Table 1.

Crystal structures relevant to ricin toxin vaccine development

PDBa	Description	Reference
2AAI	ricin	[20]
1RTC	recombinant RTA	[105]
3SRP	RiVax	[53]
3MK9b	RVEc (RTA1–33/44–198)	[57]
Antibody-ricin Interactions
4LGP	VHH E5-RTA complex	[97]
4KUC	Fab 6C2-RTA complex	[102]

^aIdentification number assigned by the Research Collaboratory for Structural Bioinformatics (RCSB) Protein Database (PDB);

^b, 3MK9 is a disulfide bond-stabilized variant of RVEc, as Compton and colleagues were unable to obtain X-ray crystallographic data of RVEc (1–33/44–198) itself.